NEC NEC MultiSync LCD1550X LCD1550X LCD1550X, Service Manual

Page: 72 / 209

2-17
2.9.3 Standards for display conditions (standard for errors/defects)
In case the state of the picture displayed is not fully stable (when the power switch is turned ON/OFF, the back
light is operating to turn on and so on), the following standards should not be applied.
No. Standard Allow ance Unit Remarks
㽲
Continuous 2 bright dots
㻡
2
㽳
Continuous 2 black dots
㻡
2
㽴
Continuous 3 or more bright dots
㻡
0
㽵
Continuous 3 or more black dots
㻡
0
Dot
defect
㽶
Dot defects other than
㽲
and
㽳
R/G/B (black and bright dots)
㻡
4
Piece Note 4
㽷
Adjacent same colored bright dot
defects
Distance betw een defects
㻡
5.5mm
Each color
㻡
2
Note 5
㽸
Approach of adjacent defects of
㽷
Distance of approach
㻡
15mm
㻡
0
Note 6
A set of 2 or more dot defects in an
area of 5x5 pixels
(
㽶
in consideration)
㻡
2
Cluster Note 7
Approach of adjacent defects of
㽲
in an aria of 5x5 pixels
Approach of adjacent defects of
㽳
in an aria of 5x5 pixels
㻡
4
-
㻡
4
-
Piece
*10: DO NOT use "ND" filter in counting bright dot(s).
Item
Both same and different colored
dots should be counted.
Note 1
Note 2
Note 3
Note 8
*9:1) The defective part over 30% (compare to area) of 1 dot is regarded as a dot defect.
2) When the picture pattern is set to black, the luminance more than 30% of 1 dot is regarded as a bright mode dot
defect.
3) When the picture pattern is set to w hite, the luminance below 70% of 1 dot is regarded as a black mode dot defect.
4) An independent defective dot (not adjoined to other defective dot) is regarded as a point dot defect.
5) The one composed of "n" pieces of linked defective dots is regarded as an "n" points linked dot defect.
Joined
defects
Defective
proximity
㻡
0
Pairs
Pairs
Pairs
㽹
Defect cluster
1
Appearance
inspection
during
back light
ON
Total numbers of bright dots (R/G/B) and black dots (R/G/B)
Total numbers of bright dots in G
Total
numbers
of defect
R + G, 2 continued horizontally
G + B, 2 continued horizontally
:Bright dot :Black dot
Note 1: R + G, 2 dots continued horizontally, G+B, 2 dots continued horizontally
To be counted as NG Not to be counted as NG:
Combination of bright
Combination other than
and black dot 2-horizontal combination
R G R G R G R G R G
G R
and so on.
G B G B
Distance between defects 6.5mm